Q. 28

(a) Liquids can b

Answer :

(a) Suppose gas is at point ‘A’ and temperature there is T1. Now, on increasing the temperature of the gas above critical temperature (Tc) keeping the volume constant, the gas will reach at point ‘F’ and consider there is temperature T2 and volume V1 with pressure p1.

Now on compressing the gas up to Volume V2. During this compression the pressure and volume of the gas will move along the curve FG and will reach at point G. Now, on

cooling the gas as soon as gas will reach the point ‘H’ located on isotherm of Tc, it will liquify without passing through equilibrium state. The gas will not pass through two phases because V2 of the gas is less than Vc i.e. molecules are closer to each other. Gas is at a higher pressure than critical pressure. Cooling slows down the molecular motion and intermolecular forces can hold the molecules together.

(b) The given liquids in increasing order of their viscosities are as follows-

Benzene < water < ethane-1,2 diol

Ethane-1, 2-diol shows more extent of hydrogen bonding than water while in benzene hydrogen bonding is absent. This factor of hydrogen bonding makes the liquids viscous.

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